While sitting around being bored and recovering from a gall bladder operation, I decided to do some experiments with FT8. First thing I did was upgrade the software to WSJT-X v2.0. I hope this post d
No, that is a correct statement. Signal reports in WSJT-X for FT8, JT65 and JT9 are *all* measured *with regard to the noise in 2500 Hz*. Note that the tone filters in WSJT-X are on the order of less
Joe, thanks for the information. I am not exactly sure what all that means. My conclusions were based on observed data. It seems pretty obvious to me that a signal that is more than 50 dB above the n
Is the definition of "noise floor" being changed for FT8? WSJT-X (and WSJT before that) defines noise as the integrated value of noise (noise power) across the 2500 Hz (approximately based on the rec
That would be my definition of noise power also. That would not help explain the numbers produced by FT8. It's curious that my VFO1 - VFO2 measurement produces numbers very close to what FT8 reports.
HI, Thanks for sharing experience! Question to FT8 and "noise" relations - In usual case everything in passband is noise except signal of interest. So with only one FT8 signal and white noise in pass
Thanks to the folks commenting on how FT8 works. That was what I originally thought might be a possibility because that would result in a real S/N number. However that doesn't seem to be the case. Th
That is only true if you leave AGC enabled and the strong signals result in the AGC decreasing the overall sensitivity. The WSJT-X Users Guide (instructions) recommend turning off AGC. It is possible
Hi,Narroving filter in WSJT-X digi modes will degrade decodes! Best performance you'll get using wide open filters on you radio.I sugest you to look at the WSJT-X archives and find the answer to your
Correct me if im wrong: A K3 owner could easily check this. You need 2 computers, running WSJT on both. Don't know if you can run 2 instances of WSJT on a single computer. Feed the left channel from
Jerry: Clever way to evaluate FT8 SNR reports with your VFO 1 and 2 comparisons. I often see positive numbers on FT8 160 meter signal reports for strong stations on FT8. For example -- if a station i
Yesterday I said " I don't have a measurement with the results of that showdown of CW versus FT8 in dead band conditions but the answer would be interesting to know." This afternoon I tried to get an
Still doing FT8 testing this morning 3 hours after sunrise I looked for something resembling dead band conditions with only a few weak stations. There was nothing on 160 but the west coast guys were
Jerry, If you would like to do some mid-day comparison testing between FT8 and CW, let me know. Looks like the path length is about 400 miles. Jim, K9SE _________________ Searchable Archives: http://
Although I have finished my FT8 testing, there is one final thought I would like to leave with you, and also to correct one statement I made earlier. Someone thought FT8 measured the noise in the int
I think I understand much of what you are saying, but I know that I was on 160 meter FT=8 two nights ago with the speaker up fairly loud. I only heard noise. I set the AGC off and adjusted the RF gai
Author: Eugene Popov /RA0FF/ via Topband <topband@contesting.com>
Date: Tue, 25 Dec 2018 01:42:28 +0300
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Chuck, I suspect something wasnt quite right with your setup? At my QTH in W3 I can hear multiple FT8 signals on 1840kc USB (2.4khz bandwidth) from before my sunset until after sunrise. They are whin
Jerry The new mode FT8 is not all that new, actually, there are several aspects to consider, like detect the signal, decode the signal detected, make a decision to accept the decoded signal. The impr
Ok, ok. I said it wrong. When I think of 160, I say night, It was about 4:00 pm local time. Chuck W5PR _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector